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Investment securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost of Securities and Fair Values | The following tables summarize the amortized cost, allowance for credit losses and fair value of the available-for-sale debt securities and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive income at December 31, 2020 and 2019:
|  | December 31, 2020
|  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Allowance for credit losses for investments |  | Fair Value
Investment Securities |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  | $ | 2,000 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,003 |
Mortgage-backed securities - residential |  | 760,099 |  |  | 14,040 |  |  | (803) |  |  | — |  |  | 773,336 |
Mortgage-backed securities - commercial |  | 20,226 |  |  | 1,362 |  |  | — |  |  | — |  |  | 21,588 |
States and political subdivisions |  | 336,543 |  |  | 19,806 |  |  | (20) |  |  | — |  |  | 356,329 |
U.S. Treasury securities |  | 16,480 |  |  | 148 |  |  | — |  |  | — |  |  | 16,628 |
Corporate securities |  | 2,500 |  |  | 17 |  |  | (1) |  |  | — |  |  | 2,516 |
Total |  | $ | 1,137,848 |  |  | $ | 35,376 |  |  | $ | (824) |  |  | $ | — |  |  | $ | 1,172,400 |
|  | December 31, 2019 |  |
|  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair Value |  |
Investment Securities |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  | $ | 474,144 |  |  | $ | 4,829 |  |  | $ | (1,661) |  |  | $ | 477,312 |  |  |
Mortgage-backed securities - commercial |  | 12,957 |  |  | 407 |  |  | — |  |  | 13,364 |  |  |
States and political subdivisions |  | 181,178 |  |  | 8,287 |  |  | (230) |  |  | 189,235 |  |  |
U.S. Treasury securities |  | 7,426 |  |  | 22 |  |  | — |  |  | 7,448 |  |  |
Corporate securities |  | 1,000 |  |  | 22 |  |  | — |  |  | 1,022 |  |  |
Total |  | $ | 676,705 |  |  | $ | 13,567 |  |  | $ | (1,891) |  |  | $ | 688,381 |  |  |
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity | Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.
|  | December 31, |  | December 31,
|  | 2020 |  |  | 2019 |
|  | Available-for-sale |  | Available-for-sale
|  | Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
Due in one year or less |  | $ | 35,486 |  |  | $ | 35,662 |  |  | $ | 1,148 |  |  | $ | 1,152 |
Due in one to five years |  | 24,278 |  |  | 24,684 |  |  | 11,553 |  |  | 11,676 |
Due in five to ten years |  | 40,038 |  |  | 41,332 |  |  | 18,287 |  |  | 18,887 |
Due in over ten years |  | 257,721 |  |  | 275,798 |  |  | 158,616 |  |  | 165,990 |
|  | 357,523 |  |  | 377,476 |  |  | 189,604 |  |  | 197,705 |
Mortgage-backed securities - residential |  | 760,099 |  |  | 773,336 |  |  | 474,144 |  |  | 477,312 |
Mortgage-backed securities - commercial |  | 20,226 |  |  | 21,588 |  |  | 12,957 |  |  | 13,364 |
Total debt securities |  | $ | 1,137,848 |  |  | $ | 1,172,400 |  |  | $ | 676,705 |  |  | $ | 688,381 |
Schedule of Sales and Other Dispositions of Available-for-Sale Securities | Sales and other dispositions of available-for-sale securities were as follows:
|  |  | Year Ended December 31,
|  |  |  |  | 2020 |  |  | 2019 |  |  | 2018
Proceeds from sales |  |  |  |  | $ | 146,494 |  |  | $ | 24,498 |  |  | $ | 2,742 |
Proceeds from maturities, prepayments and calls |  |  |  |  | 220,549 |  |  | 113,018 |  |  | 73,066 |
Gross realized gains |  |  |  |  | 1,606 |  |  | 7 |  |  | 9 |
Gross realized losses |  |  |  |  | 271 |  |  | 98 |  |  | 44 |
Schedule of Gross Unrealized Losses | The following tables show gross unrealized losses for which an allowance for credit losses has not been recorded at December 31, 2020 and December 31, 2019, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
|  | December 31, 2020
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
U.S. government agency securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Mortgage-backed securities - residential |  | 182,012 |  |  | (803) |  |  | — |  |  | — |  |  | 182,012 |  |  | (803) |
States and political subdivisions |  | 3,184 |  |  | (20) |  |  | — |  |  | — |  |  | 3,184 |  |  | (20) |
Corporate securities |  | 499 |  |  | (1) |  |  | — |  |  | — |  |  | 499 |  |  | (1) |
Total |  | $ | 185,695 |  |  | $ | (824) |  |  | $ | — |  |  | $ | — |  |  | $ | 185,695 |  |  | $ | (824) |
|  | December 31, 2019
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized loss
Mortgage-backed securities - residential |  | $ | 47,641 |  |  | $ | (164) |  |  | $ | 175,730 |  |  | $ | (1,497) |  |  | $ | 223,371 |  |  | $ | (1,661) |
States and political subdivisions |  | 15,433 |  |  | (230) |  |  | — |  |  | — |  |  | 15,433 |  |  | (230) |
Total |  | $ | 63,074 |  |  | $ | (394) |  |  | $ | 175,730 |  |  | $ | (1,497) |  |  | $ | 238,804 |  |  | $ | (1,891) |

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